Audio system



FIG. 1 is a top, front and left side perspective view of the an audio system showing my new design.

FIG. 2 is a bottom, front, and left side perspective view thereof;

FIG. 3 is a front orthogonal view thereof;

FIG. 4 is a rear orthogonal view thereof;

FIG. 5 is a left side orthogonal view thereof, the right side orthogonal view is a mirror image of the left side;

FIG. 6 is a top orthogonal view thereof; and,

FIG. 7 is a bottom orthogonal view thereof.

The broken lines are for illustrative purpose and form no part of the claimed design. 

The ornamental design for an audio system, as shown and described. 